Claims
- 1. A tone source circuit for an electronic musical instrument comprising:
- a top octave generator circuit means for frequency dividing a signal from a main oscillator to produce tone signals which respectively represent the highest frequency of each of the tones C to B of a 12 tone musical scale;
- a respective frequency divider group having frequency dividing stages in each group for each of said 12 tone signals for dividing the respective tone signals sequentially by 2 to obtain output tone signals having feet ratios selected from the group consisting of 1', 2', 4', 8', 16', and 32';
- a feet select circuit means respectively selecting from each frequency divider group three tone signals, each of different feet ratios;
- a waveshape circuit forming means forming a plurality of rectangular tone signal waveshapes of different duty ratios from said three tone signals;
- a waveshape select circuit means controlling said waveshape circuit forming means to thereby select a rectangular tone signal waveshape of desired duty ratio; and
- gate circuit means delivering said selected rectangular tone signal waveshape in response to a key depression signal provided from a keyboard.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52-132832 |
Nov 1977 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 953,923 filed Oct. 23, 1978, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2221336 |
Nov 1973 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Simonton, "Portable Mini-Organ", Radio-Electronics, Jan. 1977, pp. 31-34. |
Continuations (1)
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Number |
Date |
Country |
Parent |
953923 |
Oct 1978 |
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